Huanjiao Toolbox
Free online tools — all run in your browser, your data stays private
JSON Formatter
Beautify, compress, validate, and tree-view JSON. All in you…
Image Compressor
Compress images directly in your browser with no upload. Sup…
QR Code Generator
Generate beautiful custom QR codes. Customize colors and siz…
Markdown Editor
Split-pane real-time preview · Export to HTML/Markdown · 100…
WeChat Formatter
Paste the Markdown generated by Claude or ChatGPT and turn i…
Text Diff
Compare two texts side by side with line-level and word-leve…
Base64 Encode Decode
Encode and decode text in one click, with full UTF-8 support…
Timestamp Converter
Convert between Unix timestamps and dates/times, with second…
Password Generator
Customize length and character types, get a real-time streng…
Regex Tester
Real-time match highlighting, capture group display, and a h…
URL Encode Decode
Encode and decode URLs and parameters in one click, with cor…
Color Converter
Convert between HEX, RGB, HSL, and OKLCH in real time, with …
UUID Generator
Quickly generate UUID v4 and v1, with batch and custom forma…
JWT Debugger
Paste a JWT token to view its Header, Payload, and Signature…
Case Converter
Convert text between camelCase, snake_case, PascalCase, keba…
Word Counter
Count words, characters and sentences, estimate reading time…
WiFi QR Code Generator
Enter your WiFi name and password to generate a QR code gues…
File Size Converter
Convert between B, KB, MB, GB and TB in one step, and see ho…
SVG Placeholder Generator
Set size, colors, and text to generate placeholders you can …
Image Resizer
Scale images to any size, or apply social media presets for …
Image Format Converter
Convert images between PNG / JPG / WebP / ICO right in your …
Image Watermark
Add text watermarks to photos and design files to protect yo…
Gradient Generator
Create beautiful gradient backgrounds with a visual editor: …
Box Shadow Generator
Drag sliders to adjust horizontal offset, vertical offset, b…
VCard QR Code Generator
Enter name, phone, email, company and more to generate a bus…
PX to CM Converter
Enter a pixel value and it converts to centimeters and inche…
Random Picker
Enter options and randomly pick one result in a click. Great…
QR Code Decoder
Upload or paste an image containing a QR code and instantly …
PDF Merge
Merge multiple PDF files into one. Supports drag-to-reorder,…
PDF Split
Extract specific pages from a PDF into a new file, or split …
SQL Formatter
Beautify messy SQL in one click, with support for MySQL, Pos…
Fake User Data Generator
Generate realistic fake user data in bulk: names, emails, ph…
Lorem Ipsum Generator
Generate placeholder text in seconds, by paragraph, sentence…
Code Beautifier
Format JavaScript, CSS, and HTML code in one click, automati…
HEIC to JPG Converter
Convert HEIC photos taken on iPhone to universal JPG / PNG f…
PDF Rotate
Rotate PDF pages by 90° / 180° / 270° and fix upside-down sc…
Color Picker
Pick colors in real time, auto-generate complementary / tria…
Timezone Converter
Convert a single time into multiple world timezones at once.…
cURL to Code Converter
Convert a cURL command into HTTP request code in JavaScript …
Cron Expression Parser & Generator
Translate cron expressions into human-readable schedules, or…
IP Subnet Calculator
Enter an IP and CIDR to instantly compute the network addres…
Radix Converter
Convert between binary, octal, decimal, and hexadecimal in o…
JSON to Entity Class
Paste a JSON object and auto-generate the matching Java POJO…
Online Ping & Latency Test
Test a website's response speed and availability right in yo…
MAC Address Converter
Convert a MAC address between colon, hyphen, dotted and Cisc…
Simplified Traditional Chinese Converter
Convert between Simplified and Traditional Chinese in one cl…
To-Do List
A simple to-do list that auto-saves to your browser's local …
URL Parser
Enter any URL and break it down into protocol, domain, port,…
Zodiac Sign Calculator
Enter your birth date to instantly find your Western zodiac …
Daily Fortune
Enter your birth date to see today's overall fortune, lucky …
License Plate Lookup
Enter a license plate number or province code to instantly f…
YAML/JSON Converter
Convert YAML to JSON and JSON to YAML in one click, with for…
Bazi (Eight Characters) Calculator
Enter your birth date, hour, and gender to automatically cha…
AES Encrypt / Decrypt
Enter a password to encrypt or decrypt text with AES-256-GCM…
Screen Recorder
Record your screen with one click, optionally recording micr…
Image to Base64 Converter
Convert images to Base64 and Base64 back to images in one cl…